Bolt anchor



June 24 1924.

\ H. w. PLEISTER BOLT ANCHOR Filed may 29. 1923 IN VEN TOR 20 pointed out in the claims.

, Patented .lune'2 4, 1924."

A -1,499,012 PATENT orncs.

UNITED STATES.

HENRY W. 'PLEISTEB, OF WESTFIELD, NEW JERSEY, ASSIGNOR TO HENRY B.

, NEWHALL.

BOLT Ancnoa.

Application filed my 29 1923. Serial 1T0. 642,188.

To all whom it may concern: Y

Be it known that I, HENRY W. P-rnis'rnn, a citizen of the United States, residing at Westfield, in the county of Union and State of New Jersey, have made a certain new and useful Improvement in Bolt Anchors, of

which the following is a specification, taken in connection with the accompanying-drawingi. '10 y invention relates to bolt anchors and more particularly to a ductile bolt anchor which will permit a particular sized bolt anchor to be used with the greatest possible ran e of screws, or other expanding means, of ifierent sizes or diameters.

My invention further relates to an article ofmanufacture, combinations and details of construction, which will be more fully hereinafter described in the specification and In the accompanying drawings showing an illustrative embodiment of my invention, and in which the same reference numerals refer to similar parts in the several figures; Fig. 1 is a side elevation of the preferred form of my bolt anchor;

Fig. 2 is a front elevation, looking into the ductile bolt anchor;

s Fig. 3 is a rear elevation, so bolt anchor; f

Fig. 4 is a plan view; 7 Fi 5 is a cross-section on the line 5-5 of Fig. 1 on an enlarged scale;

Fig. 6 is a cross-section on the line 6-6 of Fig. 1.0n, an enlarged scale;

i 7 is a vertical section on he line 77 ofg. 2; 1

Fig. 8 is a horizontal section on the line 8-8 of Fig. 1; Fi .9 is a vertical section through a wall or oigier suitable support, the work and the bolt anchor, a'small screw being shown, cooperating with the bolt anchor;

Fig. 10 is a vertical section on the line 4| 10- 10 of Fi 9, the viewbeing on an en- "larged scale or purposes of clearer illustra- "tion'; 1

looking into the 11 is a cross-section, similar to Fig.

10, owing the position of the longitudi- I0 nally extending interior ribs, and the longitudinally extending valleys, when a large screw is employed 1n the same ductile bolt anchor.

Fig 12 is a longitudinal section similar to Fig. 8 but taken through the voids or valeys.

In installing attachments, such as electrical fixtures, insulator brackets, cable clamps, bridle rings, or any -form of attachment, which vary in size and duty to be performed, d fferent size bolt anchors and particular size screws, to fit the particular size bolt anchor have to be used. This requires a contractor to keepl in stock and to send out his mechanics wit several sizes of bolt anchors and corresponding sizes of screws, to fit the different size bolt anchors. To drill the holes for the ductile bolt anchors, different size drills to correspond with the particular size ductile anchor, have to be bought and kept on hand.

By my present invention I permit work, of

the greatest possible range, to beheld to a wall or other suitable support by a ductile anchor of a given size. In my present invention, for example, with a given size ductile anchor I may use variable diameters of screws, for example, This eliminates the necessity of the contractor carrying in stock ductile anchors'of intermediate sizes. This also ermits the contractor to equip his mec anics with one size ductile anchor and one size drill to perform practically all the work that they will be required to perform on a given job, which ordinarily would require ifi'erent size bolt anchors and corresponding screws. It will be seen, therefore, that his investment in ductile anchors need be only a few sizes, for each size will accommodate four, five or-more sizes of screws, bridle rings or other expanding means. My invention also saves confusion and error on the part of the mechanics in using the wrong olt anchor, in the wrong place and greatly simplifies the work and reduces the cost of installation.

I have shown in the accompanying drawings one form of my invention in which the ductile bolt anchor is provided with interior and exterior longitudinally which may be filled up, more or less, by the metal of the ductile anchor, dependinlg upon the degree of expansion employed. or example, in using the smallest screw, or other expandin means, the voids on'the interior and exterior of the ductile anchor will not be substantially changed from their original from #8 to #14.

;1oo extending voids my invention in screw of the maximum diameter,

anchor will be put under such 8 of the bol condition, for the small screw will simply engage with the longitudinally extendlng r1bs and in this manner expand the bolt anchor, giving. a firm and strong grip on the interior of the wall or other suitable suport. With a lar er screw, the metal of-the bolt anchor will he more or less displaced, so that the voids on the interior and exterior will be more or less filled up. With a for the particular size bolt anchor, the metal of the bolt pressure and so distorted,-as to substantially fill up allthe interior and exterior voids.

I have shown in the drawings one form of anchor, formed of any suitable ductile material such as lead or an alloy provided with exterior voids'2,i2 lying between the ex terior lon itudinally extending ribs 3,. 3.

hese voi s 2, 2 are preferably arranged so that they are of incre'asin depth from the plpint 4 to the end 5 of t e anchor where t e for the greatest displacement of metal when the largest screws are used.

The interior of the anchor is with an inclined axial bore 6 interior longitudinally exten progressively decreasing from the outer end t anchor to the inner end 5. These interior longitudinally extending ribs 7, 7 form interior longitudinally extending voids 9, 9.

My bolt anchor is provided with the usual slots 11, 11 to ermit more ready expansion of the bolt anclior, the slots terminating at 12, 12 and forming two tines 13 and 14, which are connected to the body member 15, which is formed as a ring. On the exterior leaded ing ribs 7, 7

of the body member 15, I may 'form one or more longitudinally extending ribs 16, 16 raised above the exterior surface of the bolt anchor to engage with the surface of the hole and prevent turning of the bolt anchor, as the screw 1? is screwed into the bolt anchor to expand it. For urposes of illustrating the advantages o my invention, and the wide range of screws which may be used with one size bolt anchor, I have shown a bolt anchor which will work perfectly and most advantageously with wood screws, known in the trade from #8 to #14:. In Figs. 9 and 10, I have shown the screw, for example as size #8, which is the screw numbered 17 on the his screw passes through the holds it to the wall or other suitable support 19, by cooperating with and cutting its own threads within the interior longitudinally extending ribs 7,7. It will seen from the large view, Fig. 10, that the smallsizeflscrew, for example #8, does not substantially bend or wipe over the longitudinally extending ribs 7, 7 and, there- 1 interior of the bolt which 1 is a ductile bolt' greatest expansion is exerted and allows" rovided with aaeeme fore, does not fill up the voids 9, 9 on the anchor lying between the longitudinal ribs/Z, 7. An adequate expansion, however, is obtained for the particular load represented by the work 18.

en the work 18 is heavier, a larger screw than #8 will be employed with the same bolt anchor 1. The next size screw will bend over the longitudinally extending ribs 7, 7 a little more than they are shown in Fig. 10. With'the largest size screw, which can be used with a particular size bolt anchor, for example #14 with the'particular sized bolt anchor shown, the longitudinally extendingribs 7, 7 will be distorted or wiped over until they substantially fill up the voids 9, 9. The position and distortion of the metal of the bolt anchor is shown in here the interior voids 9, 9 are substantially filled up by the larger screw distorting the longitudinally extending ribs 7, 7. At the same time this large screw will exert such an expansion that the exterior surface of the bolt anchor will be so distorted that the exterior voids formed by the valleys 2, 2 will be filled u and practically eliminated, as shown in i ll.

ile I have, for purposes of ii ustration referred to screws #8 and #14, it is, 0 course, to be understood that with a different size bolt anchor, other sizes of screws within wide ran es can be used.

Having thus escribed this invention in connection with an illustrative embodiment thereof, to the details of which I do not desire to be limited, what is claimed asnew and what is desired to secure by Letters Patent is set forth in the appended claims. What claim is 1. A. new article of manufacture comprising a ductile anchor provided with a tapered interior bore and with interior longitudinally extending ribs, and with exterior longitudinally extending valleys increasing in depth towards the rear of the bolt anchor, to form longitudinally extending voidson the exterior of the bolt anchor, the voids increasing in area towards the rear of the bolt anchor to permit greater displacement of metal at that end of the anchor.

2. A new article of manufacture ing a ductile anchor havin a continuous body member in the form 0 a ring, and a plurality of separated tines connected to the body member, the anchor having an axial bore provided withlongitudinally extending ri decreasing in height from the front to the rear of the anchor, the exterior of the bolt anchor being provided with longitudinall extending valleys.

3. g new article of manufacture comprising a ductile anchor provided with atapered interior bore and with interior longitudinally extending ribs decreasing in height from the front to the rear of the anchor,

and with exterior longitudinally extending valleys increasing in depth towards the rear of the bolt anchor, to form longitudinallyextending voids on the exterior of the bolt anchor, the voids increasing in area towards the rear of the bolt anchor to permit greater dis lacement of metal at that end of the anc or.

4. A new article of manufacture comprising a ductile anchor provided with a tapered interior bore and with interior longitudinally extending ribs, and with exterior longitudinally extending valleys increasing in out of radial aline-' the voids in- 

